Support for lamps



(110 Model.)

A. H. LUCAS.

SUPPORT FOR LAMPS.

- Patented Sept. 20, 1892.

UNITED, STATES I PATENT OFFICE.

AUSTIN H. LUCAS, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR OF TVVO- THIRDS TOGEORGE P. SHANE, OF SAME PLACE, AND EDWARD G. MILLER, OF WVILKINSBURG,PENNSYLVANIA.

SUPPORT. FOR LAMPS.

SPECIFICATION forming part of Letters Patent No. 483,071, datedSeptember 20, 1892.

I Application filed October 27,1890. Serial No. 369,402. (No model.)

To wZZ whom it may concern.-

Be it known that I, AUSTIN H. LUCAS, a citizen of the United States,residing at Pittsburg, in the county of Allegheny and State ofPennsylvania, have invented or discovered a certain new and usefulImprovement in Supports for Lamps, of which improvement the following isa specification.

The invention described herein relates to certain improvements in jibsor arms for electric lamps. These jibs or arms are secured at a suitableheight to a mast located along the curb of a street and project out fora greater or less distance over the road, preferably to a point aboutthe middle of the street.

The object of this invention is to provide for the shifting of the lampto or toward the mast before it is lowered to the ground, thus avoidingall danger or liability of accident.

In general terms the invention consists in the construction andcombination of mechanical devices or elements, all as more fullyhereinafter described and claimed. T

In the accompanying drawings, forming a part of this specification,Figure 1 isa viewin elevation of a mast having my improved jib attachedthereto. Fig. 2 is a View in elevation, on an enlarged scale, of thetrolley. Fig. 3 is a detail view of the outer end of the jib. Fig. 4: isa sectional view, the plane'of section being indicated by the line 00 m,Fig. 2. Fig. 5 is a similar view showing a modification of theconstruction of the trolley-support. Fig. 6 is a sectional view, theplane of section being indicated by the line y 3 Fig. 3; and Fig. 7 is asectional elevation of the Winding-dru ms.

In the practice of my invention the jib, consisting of the metal tube 1,the truss-rod 2, and the posts 3, is secured in any suitable manner tothe mast 4. at any desired height from the ground. At a suitabledistance from the ground two drums 5 and 6 are attached to the mast, andto one of said drums, as 6, is attached one end of a rope 7, preferablyformed of wire, said rope passing up over a pulley 8, loosely mounted onthe inner end of the jib, thence along said ib and around a pulley 9,loosely mounted in the outer end of the jib, and has its end attachedthe pulley 8 and a pulley 13, loosely mounted in the trolley, has itsopposite end attached to the lamp A.

The drums 5 and 6 are loosely mounted on a shaft 14, having its endsecured in the side pieces of the frame 15. These drums are preferablyformed with grooves in their surface and have gear-wheels 16 and 17,either formed integral therewith or so connected to said drums that thelatter will rotate with them. On a shaft 18, arranged parallel with theshaft 14., is secured a pinion 19, intermeshing with the geanwheels 16.This pinion is provided With a hub extending along the shaft to a pointoutside of one of the side pieces of the frame 15, and on the outer end.of said hub is formed a ratchet-wheel 20,

with which a pawl 21 engages, as shown in Fig. 7. A similar constructionof pinion 19, and hub and ratchet-wheel 20 is mounted loosely on theopposite end of the shaft 18, said pinion iutermeshing with thegear-Wheel 17 of the drum 6 and the ratchet-wheel being engaged by apawl 21. WVhen it is desired to rotate the pinion 19", which, asheretofore stated, is loosely mounted on the shaft 18, the crank 22,which is provided with a squared socket engaging the similarly-shapedend of the shaft 18, is locked to the ratchet-wheel 20 by means of athreaded pin 23, screwing through the crank and having its outer endadapted to engage the ratchet-wheel, as shown in Fig. 7. It is preferredto form a head or button 24: on the end of the pin, said button engagingan under-cut recess in the ratchetwheel, as such construction willprevent the crank from sliding olf the end of the shaft.

As will be readily understood by reference to Fig. 7, both drums will berotated in the same direction, and by reference to Fig. 1 it will beseen that the ropes are so arranged on the drums that when the latterare rotated one rope will be wound on one drum while the other rope isbeing unwound from the other drum.

In describing the operation of my device it will be assumed that theoperator is desirous of shifting the lamp A toward the mast and thenlowering it to the ground. To effect this the ratchet-wheel 20 isconnected to the crank by screwing in the ,pin 23. Then the crank andwith it both drums are so rotated that the rope 12 will be wound up onthe drum 5 and the rope 7 unwound from the drum 6, thereby drawing thetrolley 10 in toward the mast. During this operation the ropes 7 and 12form practically one continuous rope. After the lamp has been thus drawnin the pin 23 is disengaged from the ratchet-wheel 20,which, togetherwith the drum 6, is held as against rotation by the pawl21". The pawl 21is next raised from engagement with the ratchetwheel 20 and the drum 5is rotated so as to unwind the rope 12 therefrom, thus lowering the lampA to the ground. After the lamp has been trimmed the drum 5 is rotatedso as to wind up the rope 12 until the lamp is raised up to the trolley10, when the ratchet-wheel 20 is again locked to the crank,which is thenturned so that the rope 7 will be wound on the drum 6, while the rope 12is equally unwound from the drum 5, thereby shifting the trolley andlamp to the outer end of the jib or arm.

It will be observed that in the construction shown in Fig. 1 the portionof the rope 7 between the pulleys 8 and 9serves as a support for thetrolley. In order to relieve the rope 7 from the weight of the trolleywhen shifted to the outer end of the jib, spring-arms 25 are secured onopposite sidesof the case of the pulley 9, and the journals of one orboth of the friction-rolls 11 are so extended as to ride up on thespring-arms when the trolley is drawn out. If desired, the tube 1forming the jib may be longitudinally slotted and the edges of the slotso shaped as to form ways for the friction-rolls 11, which in such caseare arranged outside of the trolley-case, as shown in Fig. 5.

The spring-arms 25 are so constructed that in case either one or both ofthe ropes break or the pawls are displaced the trolley will be sustainedand held in position by said arms.

No claim is made herein, broadly, to a trolley mounted on an endlessrope passing around guide-pulleys arranged at opposite ends of a jib, incombination with arms at the outer end of the jib for supporting thetrolley.

I am aware that it is old, as shown in Patent No. 249,449, to attach theopposite ends of a cord to a movable trolley, said cord passing aroundguide-pulleys located on opposite sides of a street and a guide-pulleyaccessible from the ground, thereby forming an endless cord for shiftingthe trolley; and it is also old in such an arrangement to connect thelamp to a cord passing over a pulley on the trolley and a guide-pulleyon one side of the street, the opposite end of the cord being accessiblefrom the ground.

I claim herein as my invention- 1. The combination of a mast and a jibwith a trolley movable along the jib, two drums capable of rotationtogether or independently of each other, mounted in suitable bearings onthe mast, and two ropes connected one to each of said drums in suchmanner that when the drums are rotated in the same direction one ropewill be wound on its drum and the other rope unwound from its drum,

one of said ropes passing around guides on the jib and connected to thetrolley and the other rope passing around a guide on the jib at or nearthe mast and a guide on the trolley and connected to the lamp,substantially as set forth.

2. The combination of a mast and jib with a trolley movable along thejib, two drums mounted in suitable bearings on the mast, one of saiddrums being rotatable independently of the other, a rope connected tothe independently-rotatable drum and passing over a guide at or near themast and a guide on the trolley and connected to the lamp, and a ropeconnected to the other drum and passing over guides on the jib andconnected to the trolley, substantially as set forth.

3. The combination of a mast and jib with a trolley movable along thejib, two rotatable drums mounted in suitable hearings on the mast, andtwo ropes connected to the drums and arranged as described, one of saidropes serving as a support for the trolley, substantially as set forth.

4. The combination of a mast and jib, a trolley movable along the jib,two drums mounted in suitable bearings on the mast and connected togear-wheels, a rotatable shaft, pinions arranged on said shaft andintermeshing with the gear-wheels, one of said pinions keyed to theshaft, the other pinion adapted to be connected and disconnected fromthe shaft, and two ropes connected and arranged substantially asdescribed.

In testimony whereof I have hereunto set my hand.

AUSTIN I-I. LUCAS.

Witnesses:

DARWIN S. WOLCOTT, R. H. WHITTLESEY.

I to

